Multi-band Antenna with Nested Elements for Non-harmonic Bands
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Solution Overview
Problem
Existing antennas struggle to operate in multiple non-harmonically related frequency bands, such as 700-960 MHz, 1700-2170 MHz, and 2.4-5.8 GHz, due to their design limitations, making it difficult to provide simultaneous infrastructure access in diverse environments without using bulky structures that detract from aesthetics.
Innovation Solution
A multi-band antenna design featuring a primary antenna element and secondary elements arranged in a circular configuration, with high-frequency elements, all electrically isolated from the ground plane, allowing for capacitive coupling and tuning across different frequency bands using printed circuit boards and specific antenna feeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional whip antenna with sleeve choke is used, then the antenna can be designed for a single frequency band, but it cannot operate in multiple non-harmonically related frequency bands
Solution Approach 1:
The antenna is divided into multiple independent radiating elements, each optimized for specific frequency bands. The first radiating element handles lower frequency bands while the second radiating element handles higher frequency bands, allowing each segment to be independently tuned without affecting the other.
Solution Approach 2:
The antenna structure is designed to perform multiple functions across different frequency bands using a unified ground plane and feed structure. The common ground plane serves all frequency bands while the dual radiating elements provide universal coverage across non-harmonically related bands.
2Adaptability or versatility
If multiple separate antennas are used for different frequency bands, then each band can be optimized independently, but the overall structure becomes bulky and detracts from architecture
Solution Approach 1:
Multiple radiating elements for different frequency bands are merged into a single integrated antenna structure sharing a common ground plane and mounting substrate. This consolidation achieves multi-band operation without requiring separate antenna assemblies, reducing overall volume and aesthetic impact.
Solution Approach 2:
The antenna elements are arranged in a nested configuration where the first radiating element and second radiating element are positioned on the same substrate in a compact layout, with elements of different sizes nested or adjacent to each other to minimize the overall footprint.
3Adaptability or versatility
If the radiating elements are electrically connected to the ground plane, then the structure is simpler, but tuning across different frequency bands becomes difficult
Solution Approach 1:
Dielectric members are introduced as intermediary elements between the radiating elements and the ground plane. These dielectric members provide electrical isolation while maintaining mechanical support and positioning, enabling independent tuning of each radiating element without direct electrical connection to the ground plane.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The antenna achieves efficient operation across non-harmonically related frequency bands with a compact design, maintaining a Standing Wave Ratio (SWR) of less than 2.2 and isolation of at least 13 dB, suitable for use in various environments without compromising aesthetics.
Implementation Method 1
The first and second radiating elements are capacitively coupled to the ground plane
Data Source
AI summary
A multi-band antenna is provided that operates in non-harmonically related frequency bands. The antenna includes a primary antenna element for a first frequency band of the non-harmonically related bands, said primary antenna element extending perpendicularly from a ground plane, the primary antenna element electrically isolated from the ground plane, a plurality of secondary elements extending from the ground plane parallel to the primary antenna element and arranged in a circle around the primary antenna element, each of said plurality of secondary elements electrically isolated from the primary antenna element and ground plane and a plurality of antenna elements for a second frequency band of a higher relative frequency than the first frequency band, the plurality of high frequency antenna elements extending parallel to the primary and secondary antenna elements and disposed in a circle around the secondary antenna elements.